Novák Ádám (szerk.): Fontes Memoriae Hungariae III. Varsóban őrzött magyar vonatkozású oklevelek, 1439–1489. Közreadja: Novák Ádám, Tóth Orsolya és Tóth Péter (Debrecen, 2019)
Sobiesław Szybkowski: Polish-Hungarian Relations between 1437 and 1490. A Short Introduction
XXVIII Russian lands in the Grand Duchy of Lithuania, would be a perfect ally against the Jagiellons. Hungary and Moscow did make an alliance and sent legations to each other a few times, but Matthias was too preoccupied with the Habsburgs to fully exploit the potential of his alliance with Ivan, even though the Russian ruler encouraged him to take it to a further level. However, we know that the Hungarian king wrote to Moscow in December 1488 and assured Ivan that he was ready to invade Poland and Lithuania with him.90 When it comes to the anti-Jagiellonian Eastern policy adopted by Corvinus, we also need to mention his contacts with Mengli I Giray, Crimean Khan and a vassal of the Ottoman Emperor. The two rulers made contact some time before 1487. 91 Casimir responded to the diplomatic alliances made by Matthias by trying to form an anti-Corvinus alliance with the Hohenzollerns from Brandenburg and the Saxon Wettins. These actions included the aforementioned renewal of the alliance between Vladislaus II and his father which was forged against the Hungarian ruler.92 Soliciting the Dukes of Saxony and Brandenburg and maybe some Silesian princes for the alliance was quite probable due to the actions taken by Corvinus in Silesia. Between 1488 and 1489 a few Silesian princes of the Piast and Poděbrad Houses lost their fiefs which were handed over to John Corvinus. According to the plan of Matthias, whose health was deteriorating, this was supposed to increase John’s chances of being elected King of Hungary and Bohemia after the death of his father. Some military operations took place in Silesian territories belonging to the Dukes of Saxony and Brandenburg.93 The presence of Hungarian troops in Silesia was taken very seriously by the Polish king. In the first half of 1489, mercenaries were hired and some troops were located in the south-eastern part of Royal Prussia. Historical sources clearly indicate that this was done to protect the borders against a Hungarian attack. 94 This step was dangerous for Matthias, so he was trying to deescalate the situation by sending a legation headed by John Filipec, Bishop of Oradea, to the Polish Diet which convened in Piotrków in August 1489. The Bishop offered to form an anti-Turkish alliance between Poland and Hungary and hold congresses 90 Papée, 1904. 111–112., 140., 249.; Baczkowski, 1995B. 17–18.; Czamańska, 1996. 144., 146– 148.; Kalous, 2009. 153. 91 Papée, 1904. 249–250. 92 Dogiel, Vol. I. 23–25. (see also charter Nr. 78.) 93 Papée, 1904. 241–245.; Baczkowski, 1995B. 12.; Bárány, 2009. 391.; Techmańska, Barbara: Jan II Żagański. Niespokojny książę, sojusznik króla husyty (16 VI 1435–22 IX 1504). Kraków, 2014. 79–91., 121–122. 94 CEXV, Vol. III. Nr. 333., 337., 338., 341., 342., 343., 344., 345., 346., 348., 352., 353.; Akta stanów Prus Królewskich. Vol. II. Ed. Górski, Karol, Biskup, Marian. Toruń, 1957. 56–58., 60–61., 64., 73–76., 79–81.; Papée, 1904. 244–245.
